While both stones are quarried from the earth, granite and marble (and marble’s cousins: limestone, onyx and travertine) are very different. Granite is made of crystallized minerals formed deep in the earth’s mantle at extremely high temperatures. It is characteristically very hard and highly stain and heat resistant.
Marble starts out as sediment, animal skeletons, shells, plant matter, and silt at the bottom of bodies of water. After millions of years, this solidifies into stone. Since its main component is calcium, marble is softer and less resistant than granite to acids such as vinegar and citrus beverages.